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McLaren is due to launch an upgraded version of its MP4-12C later this year, with power pushed up by 25hp to 625hp, though the engine re-map won't affect the car's economy or emissions figures.

The news has been revealed in a letter from company MD Antony Sheriff to existing owners, offering a free power upgrade for their cars. While McLaren is at it, it will also add a few features to the car, including a remote-opening passenger door and tweaks to the sound system.

This is of course the second time that McLaren has twiddled with the 12C, the first one being to add a bit of extra 'passion' to the car.

The latest upgrade will be available from October 2012 and, for those getting it retro-fitted, Sheriff says coyly that "in order to minimise the time you spend apart from your 12C, we plan to deliver this upgrade package at the same time as we update your IRIS system". For that, read 'we will actually make the sat-nav work...'.

McLaren won't tell us anything more about the changes yet, but promises that full details of the upgrades will be coming soon.